Office photovoltaic DC power-supply system and control method

The invention discloses office photovoltaic DC power-supply system and control method, comprise PV module, control board, power amplifier board and battery module, described PV module is connected with DC bus by a DC/DC converter as power supply unit, described battery module is connected with DC bus by the 2nd DC/DC converter, DC bus is connected with lighting device, DC bus also powers to corresponding DC load and AC load by the 3rd DC/DC converter and DC/AC converter, control board regulates corresponding PV module and battery module respectively according to the DC bus-bar voltage detected.The present invention can realize the stable of direct voltage, can the direct current of stable output and alternating current, uses, be expected to the service efficiency improving electric energy, have higher practical value in the office space that DC load is relatively concentrated.